Chuck.



F. LOVENIGH.

CHUCK.

APPLIQATION FILED MAY 6. 1907.

Patented Apr. 6, 1909.

dhjlao nnirnn snares Parana onnion FRANZ LOVENICH, OF IRANKFORT-ON-THE-MAIN, GERMANY.

CHUCK.

are. eiigoe'r;

To all whom it may concern:

.Be it known that i, FRAN Lbvnnicn, a suhject of the German Emperor, and a resident of Frankfort-on the-iilain, Germany, have invented certain new and useful Improvements in Chucks, of which the foliowing IS a specification.

My invention relates to improvements in chucks, and the object of my improvements is to provide a chuck by means of which screwdrivers, wrenches, or similar tools caube mounted on the spindle of a drill press or lathe, whereby screws, nuts or the ike can be mechanically fixed. For this purpose the chuck is so constructed as not to rotate the tool mounted thereon permanently, but only While it is moved downward, and while the tool engages the screw, or nut, and theobject to which the latter is intended to be fixed. To effect this, aclutch mechanism is'provided between the chuck and the tool, which clutch mechanism is normally held open, so that the tool is not con led to the chuck, and it is closed only whi e axial thrust is exerted on the tool by engagin the screw or nut, and the object intended to receive the latter.

The invention further consists in providing means to prevent injury to the tool or to the object to oe operated on, in case the resistance offered to the rotation of the tool be too great which will regularly occur when the screw or nut has been fixed. ii in such cases the rotation of the tool. were continued,

'3 Referring showin a modification of the chuck.

Simil ar numerals 01? reference refer to s milar parts throughout the views.

particularly to the example shown in Figs. 1 and 120i the drawings, it will he seen, that the chuck comprises a body 1 to which an element 2 is screwed or otherwise attached; At its upper end, the body 1 Specification of Letters Patent.

Application filed may 6, 1907.

' off of the screw head, or any injn 3 is not provided with a conical Patented April 6, 1909.

Serial No. 371,976.

be mounted on the spindle or mandrel of a drill press or lathe, as is usual in the art. At its lower portion, the body l is provided with a circular, axial socket 16, forming a bearing for a ring 8 having a conical axial bore 17. Said ring is rotatably located within the socket l6, and it is held position by means of coiled springs 5 arranged in radialholes 18 of the body 1 and abutting against small screws 4. The ring 3 is adapted to receive, in its bore 1-7, a tool, which,'in the example illustrated, is a screw driver 6 having on its shank an enlarged conical part 7 fitting into the borelT, The screw driver is prevented from falling out of the chuck by the element 2 and the lower shoulder provided by the conical part 7.- The upper cylindrical end of the tool 6 extends into an axial hole 8, and

abuts against a coiled spring 9 arranged with in said hole-8 and held in place by a screw 10 screwed into the upper part of said hole. The spring 9 has the tendency to drive the tool 6 out of engagement with the ring 3, when the chuck is its retracted or u per position. The rotation of the tool can therefore be stopped any time, though chuck be rotating. The rotation or the body 1 is transmitted to the ring 8 by the frictional engagement of Lllfi springs 5 with the ring 3, the friction being so regulated by the screws that, as soon as a screw has been fixed hy the screw driver 6, and the chuck is not retracted, the ring 3 will slide within the body, wherebv rotation of the screw driver is stopped. "l hus any excessive strain on the screw, or the breaking oi the screw driver is avoided. For re screw driver, illustrated as an example, any other tool having a similar iunctiom'such as a wrench, may he'suhstituted.

in the modification shown in Fig. 3, the ring here 1-6 but the tool length.

bein likewise c lindrlcal all over v diametwith a cylindrical bore, the shank or On its lower ace, ring l with notches arranged prefera rically opposite ea h other, the shank of the tool having radially projecting studs or pins ll adapted to he by said notches, as soon as the tool 6 r cshed upward by an axial thrust caused by the engagement of the tool 6 with a screw the object into which the latter is intended to he'driven. By such I g y an engagement of the pins 11 and the notches shows a socket l 5, by means of which it may 12 the toolis coupied the chuck.

[claim-2 11 In a chuck the combination with a body of a ring Within said body, springs supported in said body and bearing against the outer periphery of said ring, means for holding said springs against said ring, a tool and means for engaging t'he tool With the ring.

, 2. In a chuck the combination with a body of a ring Within said body, springs supported in said body and bearing against the outer periphery of said ring, means for adjusting the-pressure of the springs againstthe ring, a tool and means for engaging the tool with the ringor a ring Within said body, springs supported in saidbody and bearing against the outer name to this specification the 3. In a chuck the combination v vith a body I arms? I periphery of said ring and screws seated iii said body abutting against the ends of said springs to adjust the frictional engageinent 2g of said springs and ring.

4. In a chuck the combination body of a ring within said body, springs supported in said body and bearing against the buter periphery of saidring, notches on said ring, 5

a tool and pins on said tool adapted to take into the notches on the ring. j i In testimony whereof .1 have' signed my I presence of twosubscribing Witnesses. w

. FRANZ VENICH.

Witnesses: i

FRANZ HASSLAOHER,

ERWIN DEPIPELY. 

